linux-kernel - Re: [PATCH v7 7/9] usb: musb: omap2430: use the new generic PHY framework

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Date:	Mon, 24 Jun 2013 11:01:56 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<balbi@...com>
CC:	<grant.likely@...aro.org>, <tony@...mide.com>, <arnd@...db.de>,
	<swarren@...dia.com>, <sylvester.nawrocki@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<akpm@...ux-foundation.org>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <b-cousson@...com>, <linux@....linux.org.uk>,
	<benoit.cousson@...aro.org>, <mchehab@...hat.com>,
	<cesarb@...arb.net>, <davem@...emloft.net>, <rnayak@...com>,
	<shawn.guo@...aro.org>, <santosh.shilimkar@...com>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<nsekhar@...com>
Subject: Re: [PATCH v7 7/9] usb: musb: omap2430: use the new generic PHY framework

Hi,

On Tuesday 18 June 2013 03:17 PM, Felipe Balbi wrote:
> Hi,
>
> On Thu, Jun 13, 2013 at 02:13:57PM +0530, Kishon Vijay Abraham I wrote:
>> Use the generic PHY framework API to get the PHY. The usb_phy_set_resume
>> and usb_phy_set_suspend is replaced with power_on/get_sync and
>> power_off/put_sync to align with the new PHY framework.
>>
>> musb->xceiv can't be removed as of now because musb core uses xceiv.state and
>> xceiv.otg. Once there is a separate state machine to handle otg, these can be
>> moved out of xceiv and then we can start using the generic PHY framework.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>   drivers/usb/musb/musb_core.c |    1 +
>>   drivers/usb/musb/musb_core.h |    3 +++
>>   drivers/usb/musb/omap2430.c  |   29 +++++++++++++++++++++--------
>>   3 files changed, 25 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
>> index 37a261a..f732bcc 100644
>> --- a/drivers/usb/musb/musb_core.c
>> +++ b/drivers/usb/musb/musb_core.c
>> @@ -1864,6 +1864,7 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
>>   	musb->board_set_power = plat->set_power;
>>   	musb->min_power = plat->min_power;
>>   	musb->ops = plat->platform_ops;
>> +	musb->phy_label = plat->phy_label;
>>
>>   	/* The musb_platform_init() call:
>>   	 *   - adjusts musb->mregs
>> diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
>> index 7fb4819..498ae21 100644
>> --- a/drivers/usb/musb/musb_core.h
>> +++ b/drivers/usb/musb/musb_core.h
>> @@ -46,6 +46,7 @@
>>   #include <linux/usb.h>
>>   #include <linux/usb/otg.h>
>>   #include <linux/usb/musb.h>
>> +#include <linux/phy/phy.h>
>>
>>   struct musb;
>>   struct musb_hw_ep;
>> @@ -357,6 +358,7 @@ struct musb {
>>   	u16			int_tx;
>>
>>   	struct usb_phy		*xceiv;
>> +	struct phy		*phy;
>>
>>   	int nIrq;
>>   	unsigned		irq_wake:1;
>> @@ -434,6 +436,7 @@ struct musb {
>>   	unsigned                double_buffer_not_ok:1;
>>
>>   	struct musb_hdrc_config	*config;
>> +	const char		*phy_label;
>>
>>   #ifdef MUSB_CONFIG_PROC_FS
>>   	struct proc_dir_entry *proc_entry;
>> diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
>> index 628b93f..c62a004 100644
>> --- a/drivers/usb/musb/omap2430.c
>> +++ b/drivers/usb/musb/omap2430.c
>> @@ -348,14 +348,24 @@ static int omap2430_musb_init(struct musb *musb)
>>   	 * up through ULPI.  TWL4030-family PMICs include one,
>>   	 * which needs a driver, drivers aren't always needed.
>>   	 */
>> -	if (dev->parent->of_node)
>> +	if (dev->parent->of_node) {
>> +		musb->phy = devm_phy_get(dev->parent, "usb2-phy");
>> +
>> +		/* We can't totally remove musb->xceiv as of now because
>> +		 * musb core uses xceiv.state and xceiv.otg. Once we have
>> +		 * a separate state machine to handle otg, these can be moved
>> +		 * out of xceiv and then we can start using the generic PHY
>> +		 * framework
>> +		 */
>>   		musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent,
>>   		    "usb-phy", 0);
>> -	else
>> +	} else {
>>   		musb->xceiv = devm_usb_get_phy_dev(dev, 0);
>> +		musb->phy = devm_phy_get(dev, musb->phy_label);
>> +	}
>>
>> -	if (IS_ERR(musb->xceiv)) {
>> -		status = PTR_ERR(musb->xceiv);
>> +	if (IS_ERR(musb->xceiv) || IS_ERR(musb->phy)) {
>> +		status = PTR_ERR(musb->xceiv) | PTR_ERR(musb->phy);
>>
>>   		if (status == -ENXIO)
>>   			return status;
>> @@ -397,9 +407,10 @@ static int omap2430_musb_init(struct musb *musb)
>>   	if (glue->status != OMAP_MUSB_UNKNOWN)
>>   		omap_musb_set_mailbox(glue);
>>
>> -	usb_phy_init(musb->xceiv);
>> +	phy_init(musb->phy);
>>
>>   	pm_runtime_put_noidle(musb->controller);
>> +	phy_pm_runtime_put(musb->phy);
>
> see, weird unbalanced calls :-)
>
> Make it all explicit:
>
> phy_pm_runtime_get_sync(phy);
> phy_init(phy);
> phy_pm_runtime_put(phy);

I think then it makes sense to drop get_sync from phy_init()?

Thanks
Kishon
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